Mixdog v0.9.67

Desktop UX round: tool-card presentation contract (collapsed header / one-line summary on expand, shared TUI derivation, mono type), stale-transcript fixes for + drafts and attached sessions, scroll/entry performance (TurnReview polling, overscan warm-up), composer autofocus, sidebar selection mirror, webhook relay tunnel.

Full Changelog: v0.9.66...v0.9.67